CCTMXTiledMap转换像素到网格

Question

需要转换字符子视图的像素坐标为网格坐标，用以检测用户是否触摸到地图的确定位置。

代码：

CGPoint mappos = [tileMapNode convertToNodeSpace:position];
mappos.x = (int) mappos.x / tileWidth;
mappos.y = (int) mappos.y / tileWidth;

CCTMXLayer *metaLayer = [tileMapNode layerNamed:@"Meta"];
CCSprite *metaTile = [metaLayer tileAt:ccp(mappos.x, mappos.y)];

if (metaTile)
{
    NSLog(@"HIT!");
}

但是没有达到预期的结果，请高手指教~

Answer 1

#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define TILE_SIZE       ( IS_IPAD ? 64 : 32 )
#define TILE_IN_ROW     ( IS_IPAD ? 19 : 19 )
#define TILE_IN_COL     ( IS_IPAD ? 32 : 30 )
#define TILE_MAP_HEIGHT  (TILE_IN_COL*TILE_SIZE) 
#define PP_TILE_META_LAYER      @"Meta"
#define PP_TILE_MAP_BG_LAYER    @"Background"    
- (CGPoint)getTileCoordForPosition:(CGPoint)position
{
    int maxTileCol = self.mapSize.height; 
    int x = ( (position.x-self.position.x)/TILE_SIZE);
    int y = maxTileCol - ( ((position.y)-self.position.y)/TILE_SIZE);
    if( x >= TILE_IN_ROW)
        x = TILE_IN_ROW - 1;
    if( y >= TILE_IN_COL)
        y = TILE_IN_COL - 1;    
    return ccp(x, y);
}
    mBgLayer = [self layerNamed:PP_TILE_MAP_BG_LAYER];
    CGPoint point = [self getTileCoordForPosition:position];
    CCSprite *sprite = [mBgLayer tileAt:point];

我就用这段代码解决的。